And arnold francis van pelt



Oct. 23, 1928.

F. FISCHER ET AL ELECTRICAL SPARK IGNITION MEANS FOR BURNERS Filed July8. 1927 Patented Oct. 23, 1928.

UNITED STATES 1,688,864 PATENT OFFICE.

FRANK rrsonnn, or LARCHMONT, NEW "roan AND ARNOLD FRANCIS VAN run-orINTERLAKEN, NEW JERSEY, ASSIGNORS DELAWARE, on NEW YORK, N. Y.

TO GRANT OIL BURNER CORPORATION OF ELECTRICAL SPARK IGNITION MEANS FORBURNERS.

Application filed m a, 1927. Serial No. 204,330.

Our invention relates to safety ignition means for oil burners similarto the arrangement disclosed in our co-pending application Serial No.120,855, and pertains particularly to an improvement in thecircuitwhereby an electrical spark of suitable intensity must be presentin order to permit operation of the burner.

lhis circuit embodies a relay in series with one of the coils of theignition spark transformer, whereby an open circuit or even aninsuificient flow of current in either the primary or secondary circuitwill prevent opera tion of the burner. It also embodies means whereby ashort circuit or partial short circuit of the spark gap will preventoperation of the burner.

One of the objects of our invention is to provide a combination ofapparatus requiring less minute adjustment than the arrangementsillustrated in our co-pending application. I

Other objects will hereinafter appear.

The nature and scope of our invention are more thoroughly explained inthe following description taken in connection with the accompanyingdrawings forming part of this specification, in which:

Fig. l is a diagram of our spark control circuit in which a relay isplaced in'series with the primary of the ignition transformer, and asecond transformer and relay are actuated by thesecondary circuit of theignition "transformer. v

Fig. 11 is a similar circuit with the first relay in series with thesecondary of the ignition transformer.

Similar numerals refer to similar parts in all of the figures in which:

1 and 2 are alternating current power leads, 3\ is a motor,-4 and 5 areelectrodes separated by spark-gap'6. 7 is a wire connecting one sidev ofignition transformer primary coil 9 to'1ead 1 when switch 10 is closed.8 in Fig.

1' 1,. connects the other side of primary coil 9 in series with relaycoil-22 which is in turn connected to lead 2.1 Switch 10 represents"either a manually operated switch or any type of thermostat orautomatic switch for closing,

and opening thecircuit. g g In the arrangements shown, the air and oilpump 16pis' driven by motor 3 and discharges a combustible mixture .ofoil'and air through conduit 17 and nozzle .18 into the firebox of thefurnace. v i

The ignition transformer secondary coil 11 is connected by means ofwires 12 and 13 to said electrodes 4: and 5. 14 and 15 are wires!connecting the primary 25 of a second transformer in parallel with thesecondary 11 of the ignition transformer. The secondary 26 of the secondtransformer is connected in parallel with relay coil 19. 20 is thearmature actuated by relay-coil 19, and 21 is the point with which 20contacts to connect one side of motor 3 with the armature 23 of relaycoil 22; Armature 23 inturnconnects with contact point 24 which is inturn connected with power-lead 2.

In Fig. ll relay coil 22 is connected in series with secondary coil 11of the ignition transformer.

The operation of our electrical ignition circuit'is as follows:

The power current is always presumed to be on leads 1 and 2.

When the control switch 10 is closed (see Fig. l) relay coil 22 andprimary coil 9 of the ignition transformer are energized This latterenergize'sthe high-tension secondary coil 11 producing a voltage of say10,000 volts which normally causes a spark to jump across the3ispark-gap 6 between the electrodes d an 5.

When the proper spark is passing between v thus energized. Relay coil22, being energized by thefiow of current through the primary 9 of theignition transformer, raises armature 23 to contact with point 24.

Since the switch mechanisms of both relays are in series with motor 3,the latter is con nected across the main power leads 1 and 2 only whenboth relays are simultaneously energ1zed.

If electrodes): and 5 should be ulled apart so that. a s 'table current.coul not jump acrossgap 6, heamount of current passing I throu hthecoils 11 and 9 of the ignition I trans ormer would bereduced to such anextent that relay magnet 22 would. droparma- I nition transformerconstitutes an important.

ture 23 and thereby break the circuit to motor 3.1

If on the other hand, carbon should build up on electrodes 4 and 5 andthe secondary circuit thereby, or for any other reason, should becomepartially or wholly short-circuited, then the amount of current flowingthrough the primary coil 25, would be reduced, secondary coil 26. wouldreceive less energy, and consequently relay coil 19 would releasearmature 20 and thereby break the motor circuit at point 21. Thus, relaycoil 19 will open the motor circuit in case of a. short in the ignitioncircuit, and relay coil 22 will break the motor circuit if the ignitioncircuit is open.

In the arrangement shown in Fig. II, where relay coil 22 is connected inseries with the secondary instead of with the primary of the ignitiontransformer, the operation is identical with that described for Fig. 1,since lack of current flow in the ignition circuit will obviously causerelay coil 22 to release the armature 23 and thereby break the motorcircuit; The arrangement of a special relay in series with the primaryor the secondary of the-igfeature of our invention. V Transformer coils25 and 26, and relay 19 constitute only one of the means we have in mindfor preventing operation'of-the motor when an insufficient spark isproduced across electrodes 5 and 6. For instance, a vacuum or gas-filledtube can be connected suitably to operate from the potential existingacross the gap, and when thus energized can be made to serve relay 19the same' as is ew done by transformer coils 25 and 26; or the tube canbe made to act as a relay to replace relay 19.

Having described our invention, what we claim and [desire to secure byLetters Patent 1. In a burner ignition control device, a power circuit,atransformer having its primary connected to the power circu1t, a pairof spaced electrodes forming a. sparkgap'for' igniting the burner, saidelectrodes being connected to the secondary ofjthe transformer,

a relay switch having its coil inseries with the transformer for openingthe power circuit when the electrode circuit is .too widely opened,-asecond transformer with one 0011 shunted across the electrodes and meanscontrolled by said seoond transformer for open- I ed around the motor aning the power circuit when the electrodes are er, a second transformerhaving one coil in parallel with the electrodes so as to be energizedwhen a spark is present at the gap and de-ener ized when the electrodesare shortcircuite and means actuated by the second transformer foropenin the power circuit when the electrodes are s ort-c-ircuited.

3. In an electrical circuit for burners, a power circuit, a fuel-supplymotor, a relay switch having a coil and contactors, the motor andcontactors bein in series in the power circuit, a transformer Iiavin it;primary shuntcontactors, a pair of spaced electrodes forming a spark-gasaid electrodes being connected to the secon ary circuit of thetransformer, the coil of the switch being in series with the transformerso as to 0 en the contactors when the pre determine minimum currentflows through the secondary circuit, a second transformer having 1118'primary shunted across the electrodes and a relay switch having itscontactors in-series in the power circuit and having its coil connectedto the secondary of the I parallel with the electrodes and its secondaryconnected to the second coil so as to de-energize the second coils whenthe. electrodes are short circuited."

FRANK FISCHER.

second transformer so as to open said contactor's when the secondtransformer is de- I ARNOLD FRANCIS VAN BELT.

